8 letters · 12 points in Scrabble
adjective capable of being graded (for quality or rank or size etc.)
originEtymology tree English grade Proto-Indo-European *-tḗr Proto-Indo-European *-dʰlom Proto-Indo-European *-dʰlis Proto-Italic *-ðlis Latin -bilis Latin -ābilis Old French -ablebor. Middle English -able English -able English gradable From grade + -able.
Etymology from Wiktionary, CC BY-SA 3.0